The special effects code of continuous rolling of Web page text

<div id= "Marquees" > <!--these are the contents of the caption, you can define-->
<a href=http://www.jzread.com/web/js/2010-01-08/ 376.html> scrolling text link 1</a>
<br> <a href=http://www.jzread.com/web/js/2010-01-08/376.html> Scrolling text links 2</a>
<br> <a href=http://www.jzread.com/web/js/2010-01-08/376.html> scrolling text links 3</a
<br> <a href=http://www.jzread.com/web/js/2010-01-08/376.html> scrolling text link 4</a>
<br > <!--subtitles end of
</div>
<!--The following are JavaScript code
<script language= "JavaScript" >
<!--
marqueesheight=200//content area height
Stopscroll=false//This variable controls whether to stop scrolling
with (marquees) {
Nowrap=true ; The content area of this table does not wrap
style.width=0;//So we can set its width to 0 because it will be propped up
Style.height=marqueesheight
style.overflowy= Hidden "; Scroll bars are not visible
Onmouseover=new function ("stopscroll=true");//mouse over, stop scrolling
onmouseout=new function ("Stopscroll=false "); Mouse left, start scrolling
}
//At this point, the height of the content area is unreadable. The following outputs an invisible layer "templayer", which is later copied to theInside:
document.write (' <div id= "Templayer" style= "Position:absolute;z-index:1;visibility:hidden" ></div > ');
Function init () {//Initialize scrolling content
//multiple copies of the original content to "Templayer" until the height of "templayer" is greater than the content area height:
While Templayer.offsetheight <marqueesheight) {
templayer.innerhtml+=marquees.innerhtml
}///copy "Templayer" content "twice times" back to the original content area:
marquees.innerhtml=templayer.innerhtml+templayer.innerhtml;
//sets a continuous timeout, invoking the Scrollup () function to drive the scroll bar:
SetInterval ("Scrollup ()",),
}
Document.body.onload=init;
Pretop=0//This variable is used to determine if the scroll bar has reached its end
function Scrollup () {//scroll bar's driver
if (stopscroll==true) return; Stopscroll "True, stop scrolling
pretop=marquees.scrolltop//record scroll bar position before scrolling
marquees.scrolltop+=1//Scroll down one pixel
// If the scroll bar does not move, scroll up to the same position as the current screen
//not only that, but also scroll down one pixel (+1):
if (pretop==marquees.scrolltop) {
marquees.scrolltop=templayer.offsetheight-marqueesheight+1;
}

</script>
;